前处理对不锈钢表面化学镀Ni-P镀层结合力影响的研究  

Effect of Pretreatment on the Adhesion of Electroless Ni-P Coating on Stainless Steel

作　　者：郝龙[1] 冯全芬[2] 沈伟[3] 林安[1] 甘复兴[1] 

机构地区：[1]武汉大学资源与环境科学学院环境工程系,湖北武汉430079 [2]武汉大学土木建筑工程学院市政工程系,湖北武汉430079 [3]武汉材料保护研究所,湖北武汉430030

出　　处：《材料保护》2008年第3期25-27,共3页Materials Protection

摘　　要：为了在不锈钢表面获得结合力合格的化学镀Ni-P镀层,研究了化学活化、化学活化+闪镀镍、阳极活化+闪镀镍3种前处理工艺对不锈钢上化学镀Ni-P层结合力的影响。采用淬冷法和划痕试验2种镀层结合力测试方法,对化学镀Ni-P层与不锈钢基体之间的结合力进行了评价。结果表明,采用化学活化+闪镀镍和阳极活化+闪镀镍的前处理工艺,Ni-P镀层与不锈钢基体之间的结合强度合格,而采用化学活化前处理的试样,Ni-P镀层与不锈钢基体之间结合强度不合格,原因在于经化学活化后,在不锈钢表面形成了一层黑灰色的腐蚀产物。在168h的NaCl溶液中腐蚀失重试验表明,不锈钢失重1.2mg,而化学镀Ni-P镀层未发现失重,说明化学镀Ni-P镀层耐腐蚀失重性能较不锈钢为好。In order to get qualified electroless Ni-P coating on stainless steel, the influences of three different pretreatment techniques , chemical activation, chemical activation plus strike nickel plating, and anodic activation plus strike nickel plating on the adhesion of electroless Ni-P plating on stainless steel were studied. The adhesion force between the Ni-P coating and stainless steel substrate was examined making use of thermal shock test and scratch test. It was found that the samples pretreated by chemical activation plus strike nickel plating and anodic activation plus strike nickel plating had qualified adhesion. However, the sample pretreated by chemical activation had no qualified adhesion, which could be attributed to the formation of corrosion product on the stainless steel surface after chemical activation at elevated temperature. Moreover, after being immersed in NaCl solution for 168 h, the stainless steel had a weight loss of 1.2 mg, while the electroless Ni-P coating had no weight loss, indicating that the electroless Ni-P coating had better corrosion resistance than the stainless steel.

关 键 词：前处理 化学镀Ni—P 活化 不锈钢 结合力 

分 类 号：TQ153.1[化学工程—电化学工业]